I have a model 715 chambered in .308 that I bought new at a gun show in the box. Its been told to me that it is a off spring of the 710 and a cheap model at that. I have shot it four times in the last two years that I have owned it. After every outing I clean it and oil it. The first two times that I had it out it shot great with no problems. The last two times I took it out it started to jam. The bolt feels like it is starting to cease, but it only happens when there is a round chambered. Which is why I am confused. The first round cycles perfect then after that it gets harder and harder to cycle the bolt. Any ideas on what is going on? I did switch from the Remington ammo to Hornady. Would this make a difference? Should I just take the loss and move on to something else?